Engine/Transmission (1994 - 1998) snubber valve for FP guage

[onestackdram]

I was sitting here thinking today, and I came up with a question for you pump knowledgeable people out there.



I understand that the snubber valve is there to protect my guage. But I was wondering what that does to the true readings of the guage. What I mean by that is, when you adjust your valve to close it off a little to "stop" the pulsating in the guage arent you also slowing the pressure down therefore not gettin a "true" reading of pressure. The picture going through my head is like when you take your garden hose and put your thumb over the end. You go from a nice slow steady stream to a furious fast stream. Am I wrong in my thoughts or what?



Russell

 

[Deezul1]

The pressure stays the same, the volume decreases. If I am correct in my thinking then the valve limits the amount of fluid that will flow due to restriction and that is what dampens the needle movement as there are no volume spikes.

 

[PUMPERDUDE]

I'll give it a shot... . Think of a snubber as allowing you to get the average pressure. A positive displacement pump (your lift pump)will have pulsations in discharge pressue. When it is on the discharge stroke you will get a spike upward ,say 25 psi... On the suction stroke ,the pressure will dip to say 20 psi(while it catches its breath)... The "true reading" would be a blurr of the needle between 20 and 25. Hard to read and hard on gauges(even fluid filled). By snubbing, the range that the guage reads will shrink to an average. Say 22 or 23 ... . . Does this make sense?... The garden hose question is off a little because there is no flow thru the gauge . Just static pressure. Not going anywhere. Hope this helps.

 

[illflem]

The readings will only be off for the short period of time when the pressure is changing due to engine rpm or load changes but stabilizes at the correct pressure rapidly. It really doesn't matter if the readings are a little off because without a snubber you won't get a reading at all.

 

[onestackdram]

That makes sense. I was just thinking that the yesterday and thought I would throw it out there.



Russell